title: Single-exposure dual-energy computed radiography: improved detection and processing.
abstract: Recent reports have emphasized the potential for dual-energy computed radiographic applications. An improved method for single-exposure material-selective imaging with a photostimulable phosphor computed radiography system was investigated. The essential elements of the technique are (a) prefiltration with gadolinium, which divides the incident broad-beam x-ray spectrum into low-energy and high-energy peaks; (b) a cassette consisting of four photostimulable phosphor plates that record images of increasing mean energies, with a computed energy separation of 23 keV from the front to the rear plate; (c) spatially dependent scatter and beam-hardening corrections; and (d) a noise-reduction algorithm based on noise correlations between bone-selective and soft-tissue-selective dual-energy images. These elements result in improved material cancellation and signal-to-noise ratio throughout the image.
authors.affiliation: Philips Medical Systems North America, Shelton, CT 06484.
authors.forename: D L
authors.initials: DL
authors.lastname: Ergun
authors.forename: C A
authors.initials: CA
authors.lastname: Mistretta
authors.forename: D E
authors.initials: DE
authors.lastname: Brown
authors.forename: R T
authors.initials: RT
authors.lastname: Bystrianyk
authors.forename: W K
authors.initials: WK
authors.lastname: Sze
authors.forename: F
authors.initials: F
authors.lastname: Kelcz
authors.forename: D P
authors.initials: DP
authors.lastname: Naidich
mesh_terms: D000465:Algorithms; D006801:Humans; D015900:Radiography, Dual-Energy Scanned Projection; D013679:Technology, Radiologic; D014057:Tomography, X-Ray Computed